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In 1989, production stopped and work shifted to cleanup of portions of the site contaminated with hazardous substances, including both radionuclides and chemical waste.

The operations at Hanford created one of the largest and most complex cleanup projects in the U.S. Weapons production resulted in more than 43 million cubic yards of radioactive waste, and over 130 million cubic yards of contaminated soil and debris. Approximately 475 billion gallons of contaminated water was discharged to the soil. Some of the contaminants have made it to groundwater under the site. Over 80 square miles of groundwater is contaminated to levels above groundwater protection standards.

Additional cleanup sites (Click on the triangle to expand or collapse a heading and see more information)

Environmental Restoration Disposal Facility400 Area

The 400 Area is the location of the Fast Flux Text Facility. Initially designed to test advanced fuels as part of the Liquid Metal Fast Breeder Reactor Program, the Fast Flux Text Facility began full-power operation in 1982. The facility later expanded into other areas of research and development, including fusion research, space power systems, medical isotope production, and international research programs. During its standby period, the Fast Flux Test Facility was considered as a possible producer of tritium and medical isotopes for the United States. In late 2000, after seven years in standby status, deactivation of the Fast Flux Test Facility was ordered. In early 2001, however, USDOE authorized another study of Fast Flux Test Facility’s future viability as a facility to produce medical isotopes, but the reactor was finally shut down. There have been no releases from the FFTF facility, but it is being deactivated as a CERCLA action to mitigate the risk of future releases.

600 Area

The 600 Area consists of Hanford’s roads, railroads, fire station, an old concrete batch plant site, contaminated storage vaults in the east end of Gable Mountain, the former town sites of Hanford and White Bluffs, the Hanford meteorology station, the Wahluke Slope, and the Arid Lands Ecology Reserve (including Rattlesnake Mountain). There is little contamination in the 600 Area, except in the groundwater beneath large stretches. This groundwater contamination originated from the 200 Area. The Laser Interferometer Gravitational-wave Observatory is located just north of the 400 Area and is designed to detect gravitational waves originating from black holes and other astronomical phenomena. LIGO is a scientific collaboration of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT) funded by the National Science Foundation. An area along the river and north of the 300 Area is leased by Energy Northwest for operation of a commercial nuclear plant called the Columbia Generating Station.

The Hanford Federal Facility Agreement and Consent Order (also known as the Tri-Party Agreement) was signed by USDOE, EPA, and Ecology in 1989 with the purpose of coordinating the CERCLA and RCRA cleanup authorities at Hanford. The Tri-Party Agreement also outlines the process for changing, removing, or adding milestones, the conditions under which penalties may be issued, and the requirements for public involvement relating to Hanford cleanup actions. Major changes to the Tri-Party Agreement require approval of all three agencies and are only made after a public participation process has been followed.

Hanford Reach National Monument - A large portion of the cleaned up part of Hanford has been designated a national monument. This area includes the western portion of the site containing Rattlesnake mountain and the Arid Lands Ecology Reserve, the Columbia River, all the land east and north of the Columbia River, and a strip of land approximately 1/4 mile wide along the south and west edge of the Columbia River. Current Uses and Restrictions at the Hanford Reach National Monument (PDF)(6pp, 327K).